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A comment on How to circumvent Sci-Hub ISP block. Parent comment

Re:How to circumvent Sci-Hub ISP block by mandelken on Wednesday June 09, 2021 @08:32PM (#27455294)
Probably because for written text the words identify the content while the hash relates more to the digital carrier format (pdf vs epub) and id number can change between publications, countries, etc.
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Re:How to circumvent Sci-Hub ISP block by dredmorbius on Wednesday June 09, 2021 @10:46PM (#27456136)
Bingo.

And to drag in metadata, it may:

- Not be present.

- Be inaccurately applied to the correct work (metadata say the work is different, work is in fact related/same).

- Be inaccurately applied to the wrong work (metadata say the works are the same/related, they are not).

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